<?php

/**
 * @package php-font-lib
 * @link    http://php-font-lib.googlecode.com/
 * @author  Fabien M�nager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: font_woff.cls.php 39 2012-01-15 12:25:22Z fabien.menager $
 */
require_once dirname(__FILE__) . "/font_truetype.cls.php";
require_once dirname(__FILE__) . "/font_woff_table_directory_entry.cls.php";
require_once dirname(__FILE__) . "/font_woff_header.cls.php";

/**
 * WOFF font file.
 * 
 * @package php-font-lib
 */
class Font_WOFF extends Font_TrueType {

    function parseHeader() {
        if (!empty($this->header)) {
            return;
        }

        $this->header = new Font_WOFF_Header($this);
        $this->header->parse();
    }

    public function load($file) {
        parent::load($file);

        $this->parseTableEntries();
        $dataOffset = $this->pos() + count($this->directory) * 20;

        $fw = $this->getTempFile(false);
        $fr = $this->f;

        $this->f = $fw;
        $offset = $this->header->encode();

        foreach ($this->directory as $entry) {
            // Read ...
            $this->f = $fr;
            $this->seek($entry->offset);
            $data = $this->read($entry->length);

            if ($entry->length < $entry->origLength) {
                $data = gzuncompress($data);
            }

            // Prepare data ...
            $length = strlen($data);
            $entry->length = $entry->origLength = $length;
            $entry->offset = $dataOffset;

            // Write ...
            $this->f = $fw;

            // Woff Entry 
            $this->seek($offset);
            $offset += $this->write($entry->tag, 4);    // tag
            $offset += $this->writeUInt32($dataOffset); // offset
            $offset += $this->writeUInt32($length);     // length
            $offset += $this->writeUInt32($length);     // origLength
            $offset += $this->writeUInt32(Font_Table_Directory_Entry::computeChecksum($data)); // checksum
            // Data
            $this->seek($dataOffset);
            $dataOffset += $this->write($data, $length);
        }

        $this->f = $fw;
        $this->seek(0);

        // Need to re-parse this, don't know why
        $this->header = null;
        $this->directory = array();
        $this->parseTableEntries();
    }

}
